Lifeguard -- D Mark III & EF 200mm f1.8L with 1.4x Teleconverter shot wide open through a thick pane of glass.
Dillon and his school swim team made it to the OFSAA (provincial) Swim Championship and we spent a day in Milton's Sport Centre to cheer for him and his team. The Sports Centre is a very nice and huge facility that sports 4 skating rinks, a large swimming pool, two gymnasiums and a host of other amenities. Unfortunately, for today's swim competition, spectators were not allowed to go inside the pool to watch, and everyone had to watch the actions through a very thick pane of glass wall. I brought a bag full of equipment, but taking pictures of the swimmers is next to impossible. Of course, they want to sell you pictures they have captured for the event. Very disappointed and this I have been to many swim meets and this is the first that I couldn't go inside the pool or take any pictures.
Today was the first time I used the Canon 1.4x teleconverter with the EF 200mm f1.8L, for an effective focal length of 280mm f2.5. I was surprised the focusing speed was still very fast. I only shot the pictures through the glass walls and it's still usable wide open (effectively f2.5).